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      Knowledge is Power

      Scientific American October 23, 1886

      Polarized Light

      Practical Applications of the Polariscope

      • By M. Hopkins on October 23, 1886

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      More in the October 23, 1886 issue of Scientific American
      • Floods in India
      • Miscellaneous Inventions - October 23, 1886
      • The Quadrumana
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